In cardiac muscle contractile cells the release of calcium through L-type calcium channels depolarizes the sarcoplasmic reticulum and inhibits the release of any additional calcium necessary for excitation-contraction coupling.

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The release of calcium through L-type calcium channels in cardiac muscle contractile cells depolarizes the sarcoplasmic reticulum and triggers the release of additional calcium necessary for excitation-contraction coupling, not inhibits it.

In Cardiac Muscle Contractile Cells the Release of Calcium Through